Process of die casting and assembling expansion shields



' Nov. 22, 1938. R MHNTOSH 2,137,538

PROCESS OF DIE CASTING AND ASSEMBLING EXPANSION SHIELDS Fil ed Jan. 7,1957 2 Sheets-Sheet 1 INVENTOR Fey 5. McIntosh ATTORNEYS Nov. 22, 1938.R. E. MclN os 2,137,538

PROCESS OF DIE CASTING AND ASSEMBLING EXPANSION SHIELDS Filed Jan. 7,1937 2 Sheets-Sheet 2 2/ 36 an sa 52 ga ii iiii1;::=:

INVENTOR Roy E. Mcfnfash ATTORNEYS Patented Nov. 22, 1938 UNITED STATESPATENT OFFICE PROCESS OF DIE CASTING AND ASSEM- BLING EXPANSION SHIELDSRoy E. McIntosh, New York, N. Star Expansion Bolt Company,

Y., assignor to New York, N. Y.,

Claims.

This invention relates to a process of die casting and assemblingexpansion shields or anchors.

' One type of anchor, such as that illustrated in Patent No. 1,695,303,granted December 18, 1928,

5 comprises an outer element or sleeve of soft or ductile metal and aninner expanding element of harder metal having tapered or wedge portionsarranged to be forced or drawn into the sleeve,

whereby the sleeve is expanded laterally into engagement with the wallof the opening in which the anchor is positioned.

' The sleeve and expanding element are now cast separately in .pouredmolds and are then assembled.

This invention has for its salient object to simplify the making andassembling of anchor units of the character described, thereby cuttingdown on the number of operations now required for the manufacture ofsuch anchors.

Another object of the invention is to provide a simple, practical andeflicient process or method of economically manufacturing anchors of thetype described.

Further objects of the invention will appear from the followingspecification taken in connection with the drawings which form a part ofthis application, and in which- Fig. 1 is a top plan view of a group ofdie cast interconnected expanding units for a bolt anchor;

Fig. 2 is a side elevation of the structure shown in Fig. 1, one of theexpanding elements and the adjacent portions of the casing and spruebeing shown in section;

Fig. 3 is a top plan view similar to Fig. but showing the casting of thegroup of soft metal sleeves or expansible units interconnected by thesprue and adjacent portions of the casing;

Fig. 4 is a view similar to Fig. 2 and is a side elevation of thestructure shown in Fig. 3, one of the units and the adjacent portions ofthe sprue and casting being shown in section;

Fig. 5 is an elevational view showing the castings illustrated in Figs.2 and 4 in assembled relation;

Fig. 6 is an enlarged sectional elevation of one of the expandingelements disposed in one of the soft metal sleeves, these parts beingshown in the relative position taken when the two castings areassembled, as shown in Fig. 5;

Fig. 7 is a view similar to Fig. 5, but showing the position taken bythe two castings and anchor units after the expanding elements have beenforced into the expansible elements by pressure between two die members;

Fig. 8 is a view similar to Fig. 6, but showing the relative position ofthe sleeves and expanding elements when these parts have been forcedtogether to the relative position shown in Fig. 7

Fig. 9 is an elevational view of a press and 6 the two castings, theassembled castings being shown at the left in the position taken priorto the operation of the press or the depression of the plunger, and theparts being shown at the right in the position taken after the plungerhas 10 pressed the expanding elements into the expansible elements andprior to the depression of the punches or plungers which force theexpanding elements into the expansible elements and de tach or stripthese elements from their castings; 16

Fig. 10 is a sectional elevation on an enlarged scale of the twocastings and the expanding element and expansible element carriedthereby in the positions shown in Fig. 9;

Fig. 1 shows the punch or plunger in de- 20 pressed position forcing theassembled unit from the forming die after the elements have beenstripped from their sprues and adjacent portions of the casting; and

Fig. 12 is an elevational view of the anchor in 25 its completed form.

' The invention briefly described consists of a process comprising thefollowing steps, namely, die casting in a group a plurality of softmetal expansible elements or sleeves, die casting in 30 a group a likenumber of expanding elements, preferably of harder metal and radiallyarranged, and conforming in arrangement and radii to the arrangement andradii of the soft metal elements or sleeves. The two castings are thenas- 5 sembled with the expanding elements disposed in the expansibleelements or sleeves and the assembled castings are then placed in apress by which the expanding elements are forced into the expansibleelements, at the same time 40 straightening or alining the sleeves orexpansible elements. The assembled castings are then placed in asecondpress having punches or plungers which force the expanding elementsfurther into the expansible elements and force these elements throughtrimming dies and forming dies whlchtrim or strip oil the excess metalor sprues and eject the assembled units or anchors from the forming die.

Further details of the invention will appear from the following.

The process described and claimed in this application is similar incertain respects to that described in applicants co-pending application.

119,465, filed January "I, 1987, but is patentably distinct therefrom.

In the particular embodiment of the invention illustrated, the expandingelements 20 are die cast in a group and are interconnected. This figureshows the sprue 2| having a circular portion 22 and laterally extendingor radial portions 23 which are connected to the expanding elements 20.As will be understood by those familiar with the art of die casting, thecasting shown in Fig. 1 is formed in a die having a gate through whichthe metal is forced under pressure into the die, the gate communicatingwith a circular groove which in turn communicates with lateral openingswhich lead to the mold cavities in which the elements III are cast. Asshown in Fig. 2, each of the elements 20 has cast therein an internalthread 24.

The die casting shown in Figs. 3 and 4 is made in a manner similar tothat described in the preceding paragraph and comprises a plurality ofsleeves 25 which are connected by the adjacent portions of the casting,including an annular portion 26, laterally extending portions 21connected thereto and a sprue 28, the parts 21, 26 and 28 all forming aportion of the sprue.

From the illustration in Figs. 1 and 3 it will be noted that the radiusA of each of the elements 20 is the same as the radius B of each of theelements 25, and further, that these two groups of elements aresimilarly arranged and are spaced in exactly the same manner, so thatthe casting shown in Fig. 1 can be superposed on the casting shown inFig. 3 in the manner illustrated in Fig. and when so superposed theexpanding elements 20 will fit into the expansible elements or sleeves25. Fig. 6 shows the relative positions of the expanding elements andsleeves and it will be noted that the expanding elements have taperedportions 29 which rest on the upper inner edges 39 of the sleeves.

When the parts have been assembled in the manner shown in Fig. 5 theassembled castings are placed on a fixed support 30 shown in Fig. 9 anda die or plunger 3! is depressed to an extent sufficient to force theexpanding elements into the expansible sleeves to the position shown inFigs. 7 and 8.

During the operation described in the preceding paragraph, the sleeveswill be properly straightened or alined and if desired this alinementcan be accomplished before the die castings are assembled by pressingthe die casting of the sleeve or of the expanding element between planesurfaces, such as the parts 3|! and ii shown in Fig. 9.

After the two castings have been assembled in the manner shown in Fig.'7, the assembled castings are transferred to the portion of the pressshown at the right in Fig. 9, comprising a trimming die 35, a formingdie 36 and a plunger 31 having a plurality of punches 38 dependingtherefrom and arranged to engage the upper ends of the expandingelements 20.

The operation performed by the punches and trimming and forming dies, isillustrated in the sections shown in Figs. and 11. In Fig. 10 it will benoted that the sleeves 25 with the expanding elements disposed thereinare initially supported on the upper ends of the openings in thetrimming die 35. When the plunger descends the punches 38 engage theupper ends of the expanding elements and force the assembled unitsdownwardly, stripping from the expanding elements and the sleeves theadjacent portions of the casting or the sprues by which they areconnected. Furthermore, as the assembled units are forced through theforming die a the expanding elements will be pressed into the soft metalsleeves to form the anchor in its completed form shown in Figs. 11 and12.

From the foregoing description it will be clear that a simple, practicaland eftlcient process of making and assembling expansion anchor elementshas been worked out and that this process will eliminate many operationsnow necessary in the manufacture and assembling of these elements.

Although one specific embodiment of the invention has been particularlyshown and described it will be understood that the invention is notlimited to the particular steps or sequence of steps outlined, but thatthe process may be modified and no limitations are intended other thanthose set forth in the appended claims.

What I claim is:

1. The process of making and assembling inner expanding elements andouter expansible elements for expansion anchors which consists of diecasting a plurality of expanding elements of relatively hard metal in aninterconnected group, die casting a like number of similarly arrangedand similarly spaced interconnected expansible elements of relativelysoft metal, inserting the group of expanding elements in the group ofexpansible elements while the elements of both groups are stillinterconnected, pressing the inner elements into the outer elements andtrimming oil the excess casting metal and connecting portions of thecastings.

2. The process of making and assembling inner expanding elements andouter expansible elements for expansion anchors which consists of diecasting a plurality of expanding elements of relatively hard metal in aninterconnected group, die casting a like number of similarly arrangedand similarly spaced interconnected expansible elements of relativelysoft metal, inserting the group of expanding elements in the group ofexpansible elements while the elements of both groups are stillinterconnected, pressing the inner elements into the outer elements and,during the operation, trimming off the excess casting metal andconnecting portions of the castngs. 3. The process of making andassembling inner expanding elements and outer expansible elements forexpansion anchors which consists of die casting a plurality of expandingelements of relatively hard metal in an interconnected group. diecasting a like number of similarly arranged and similarly spacedinterconnected expansible elements of relatively soft metal,straightening the expansible elements, inserting the group of expandingelements in th group of expansible elements while the elements of bothgroups are still interconnected, pressing the inner elements into theouter elements and trimming off the excess casting metal and connectingportions of the castings.

4. The process of making and assembling inner expanding elements andouter expansible elements for expansion anchors which consists of diecasting a plurality of expanding elements of relatively hard metal in aninterconnected group, die casting a like number of similarly arrangedand similarly spaced interconnecting expansible sleeves of relativelysoft metal, inserting the group of expanding elements in the group ofexpansible sleeves while the units of both groups are stillinterconnected, pressing the expanding elements into the expansiblesleeves and trimming oi! the excess casting metal and connectingportions of the castings.

5. The process of making and assembling inner expanding elements andouter expansible elements for anchors which consists of die casting aplurality of expanding elements of relatively hard metal in aninterconnected group, die cast- 10 ing a like number of similarlyarranged and similarly spaced interconnected expansible elements oirelatively soft metal, inserting the group or expanding elements in thegroup of expansible elements while the elements of both groups are stillinterconnected, pressing the inner and outer elements into a. trimmingdie and a forming die, thus trimming of! the excess metal from theelements and forcing the inner expanding elements into the outerexpansible elements.

ROY E. McINTOSH.

